Abstract
Upon illumination of etiolated maize leaves the photoconversion of protochlorophyllide Pchlide 655/650 into chlorophyllide Chlide 684/676 was observed. It was shown that chlorophyllide Chlide 684/676 in the dark is transformed into pheophytin Pheo 679/675 and chlorophyll Chl 671/668 by means of two parallel reactions, occurring at room temperature: Chlide 684/676. The formed pheophytin Pheo 679/675 was unstable and in the dark was transformed into chlorophyll Chl 671/668 in a few seconds: Pheo 679/675 → Chl 671/668. The last reaction is reversed by the light: Chl/668 Pheo 679/675. Thus, on the whole in the greening etiolated leaves this process occurs according to the following scheme:
The observed light-regulated interconversion of Mg-containing and Mg-free chlorophyll analogs is activated by ATP and inhibited by AMP.
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Abbreviations
- Chl-:
-
chlorophyll
- Chlide-:
-
chlorophyllide
- Pchlide-:
-
protochlorophyllide
- Pheo-:
-
pheophytin
- PS II RC-:
-
Photosystem II reaction centres. Abbreviations for native pigment forms: the first number after the pigment symbol corresponds to the maximum position of the low-temperature fluorescence band (nm), the second number to the maximum position of the longwave absorption band
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Ignatov, N.V., Litvin, F.F. Light-regulated pigment interconversion in pheophytin/chlorophyll-containing complexes formed during plant leaves greening. Photosynth Res 46, 445–453 (1995). https://doi.org/10.1007/BF00032299
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DOI: https://doi.org/10.1007/BF00032299